The life on the river, with its ever-changing dramatic and entertaining incidents, awoke the young man's sleeping imagination--gave him a strong desire to put to use the modest literary methods which he had acquired as an itinerant printer. Mr. Howells, too, it will be noticed, first had the passion for authorship aroused in him by the types and the presses. The first sketches which Mr. Clemens sent to the local papers were signed "Iosh," a meaningless signature, which quickly made the young author desire something better. The improvement came to him when one day he heard a "big black negro" who was taking soundings call out "Mark twain!" which meant that there were two fathoms of water. The call struck the pilot's fancy, and he kept it in mind for future use. Mr. Clemens served in the pilot-house--one of the best school-houses in the world, it may be said--until the war broke out. Then he ran blockades for a while, and for two weeks he carried a gun in the Confederate army, under General Harris. The two weeks' service cooled his ardor, and he went farther west with his brother Orion, who, as a sympathizer with the Union side, had received an appointment as Secretary of the Territory of Nevada. Samuel was to act as his brother's secretary, but as in this office he did nothing and earned nothing, he, after an attempt at prospecting, joined the staff of the _Virginia City Enterprise_. It was as the _Enterprise's_ correspondent at the capital of the Territory, Carson City, that Mr. Clemens first used the striking pseudonym "Mark Twain." But he had no taste for routine work; or, rather, his manner of garnishing, often with his stinging satire, his routine work, did not suit the taste of the editor of the _Enterprise_, and at the end of six months Mark Twain stamped the dust of Nevada from his shoes and struck out for California, where he readily secured employment on the _Union_. In the spring of 1865 he took an interest with Bret Harte in a short-lived weekly called _The Californian_, and some of the humorous articles which he wrote for that publication were widely copied in the East. Later the _Union_ sent him to the Hawaiian Islands to describe the sugar industry. His work as a correspondent was very successful, and so was the lecture tour which he made in California when he returned.